{ "items" : [
    { "id" : "http://dbpedia.org/resource/Gray_iron"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Gray iron, or grey cast iron, is a type of cast iron that has a graphitic microstructure. It is named after the gray color of the fracture it forms, which is due to the presence of graphite."] } } }
